\documentclass{ctexart}
\usepackage{avanti}
\everymath{\color{Solarized-magenta}}
\pagestyle{empty} % 没有页眉和页脚

 % define the plot style and the axis style
\tikzset{base/.style={smooth,thick,Solarized-base01}}
\tikzset{arrow/.style={->,>=stealth,base}}
\tikzset{curve/.style={base,Solarized-blue}}
\tikzset{point/.style={circle,fill,inner sep=1.5pt,Solarized-base01}}

\begin{document}

\begin{tikzpicture}

    \node [point,label=above:$\wv_{t-1}$] (M1) at (0,0) {};
    \node [point,label=above:$\wv_t$] (M2) at (4,1) {};
    \node [point] (M3) at (7,1.75) {};
    \node [point,label=above:$\wv_{t+1}$] (M4) at (11,1.25) {};
    \node [point] (M5) at (8,0.5) {};

    \draw[arrow] (M1) -- (M2) node [midway, draw=none, above=2pt] {$\Delta \wv_{t-1}$};
    \draw[arrow,draw=Solarized-blue,dashed] (M2) -- (M3) node [midway, draw=none, above=2pt] {$\gamma \Delta \wv_{t-1}$};
    \draw[arrow,dashed] (M3) -- (M4);
    \draw[arrow,dashed] (M2) -- (M5) node [midway, draw=none, below=2pt] {$\color{Solarized-yellow}{- \eta_t \nabla F(\wv_t)}$};
    \draw[arrow,dashed] (M5) -- (M4);
    \draw[arrow] (M2) -- (M4) node [midway, draw=none, above=0pt] {$\Delta \wv_t$};

    \node [point,label=above:$\wv_{t-1}$] (N1) at (0,-3) {};
    \node [point,label=above:$\wv_t$] (N2) at (4,-2) {};
    \node [point,label=above:$\widetilde{\wv}$] (N3) at (7,-1.25) {};
    \node [point,label=above:$\wv_{t+1}$] (N4) at (11,-2.5) {};

    \draw[arrow] (N1) -- (N2) node [midway, draw=none, above=2pt] {$\Delta \wv_{t-1}$};
    \draw[arrow,draw=Solarized-blue,dashed] (N2) -- (N3) node [midway, draw=none, above=2pt] {$\gamma \Delta \wv_{t-1}$};
    \draw[arrow,dashed] (N3) -- (N4) node [midway, draw=none, above=2pt] {$\color{Solarized-yellow}{- \eta_t \nabla F(\widetilde{\wv})}$};
    \draw[arrow] (N2) -- (N4) node [midway, draw=none, below=1pt] {$\Delta \wv_t$};
\end{tikzpicture}




\end{document}

